Blanket for printing presses and method of making the same



Aug.29, 1933. T, L, MCELROY 1,924,323

BLANXET FOR PRINTING PRESSES AND METHOD OF MAKING THE SAME Filed Dec. 2, 1930 i l 5 m.m.mmwmnvnnmrmgm-mm.nmnmmm /f I l 5 l l Patented Aug. 29, 1933 UNITED STATES PATENT OFI-'ica l,

BLANKET FOR. PRINTING PRESSES AND METHOD F MAKING THE SAME The invention has for an object to provide a blanket for printing presses having properties which serve to keep the blanket dry and free from the moisture which may accumulate on the printstance.

A further object of the invention is to manufacture a printing press blanket of a fabric to which rubber is vulcanized on one face of the blanket, the blanket being subsequently steamed and treated with a. moisture resistant material,

and finally rolled to proper thickness.

Additional objects o f the invention will appear in the following specification inwhich the preferred form of the invention is described.

In the drawing similar reference characters refer to similar parts in all the views, of which Figure 1 is a fragmentary perspective view showing the blanket to one face of which rubber has been vulcanized, Figure 2 is a sectional view illustrating the chamber in which the blanket is steamed, and

Figure 3 is a view illustrating the manner in which the blanket is treated with the moisture resistant material and is rolled to proper thick- Figure 1 of the drawing shows a felt body 5 of a blanket to one face of which there is vulcanized a rubber surface 6. The blanket is then disposed in a steam chamber 'I having an inlet pipe 8 in the cover 9 and an outlet pipe 10, the steam chamber 7 being provided with an open support 11 which may be an openwire support on which the felt body 5 with its rubber-vulcanized side is disposed. Steam is then permitted to pass into the chamber by opening a valve 12 and with the valve 13 closed. When the felt body 5 with its rubber-vulcanized face 6 has been thoroughly steamed, the felt body 5 with its rubber-vulcanized face 6 is then sprayed with a moisture resistant by means of the nozzles 14 and 15, one of these nozzles serving to spray the face 6 and the other nozzles serving to spray the felt body 5. In this way both faces of the blanket are thoroughly sprayed with a moisture resistant, after which the blanket is introduced between rollers 16 and 17 which serve to press the blanket to the proper thickness. Any suitable moisture resistant material may be used in the sprayers 14 and 15 to impregnate the blanket, including the rubber-vulcanized face 6, but preferably the sprayers 14 and 15 are used to sprinkle the blanketV and its rubber-vulcanized face with lycopodium. A

When the blanket passes through the rollers 16 and 17 and is subsequently dried it may be used on the printing press cylinder preferably withthe rubber-vulcanized face 6 against the cylinder. When so used, the blanket will not only serve all customary requirements, but it will also prevent any moisture arising at the cylinder from interfering with the -action of the blanket, or from passing through vthe blanket, to impair the function of the blanket in its use on the printing press cylinder.

It will be understood that the rubber face 6 of the blanket, which is normally disposed against the cylinder, will serve to press the felt face 5 back to normal position should the paper which is passing through the printing press during the printing process become torn and be wound against the felt face 5 of the blanket andnbe pressed abnormally thereagainst by a plate cylinder of the printing press.

Whatis claimed iszv 1. A fabric blanket for printing presses impregnated with lycopodium. Y 4

2. A method of manufacturingblankets for' printing presses, consisting of vulcanizing rubber to a face of a fabric, steaming the fabric, spraying the fabric with a moisture resistant, and rolling the fabric. Y 3. A method of manufacturing blankets for printing presses, consisting of vulcanizing rubber to a face of a fabric, steaming the fabric, treating the fabric with a substance having the characteristics .of lycopodium, and rolling the fabric.

4. A method of manufacturing blankets for printing presses, consisting of vulcanizing rubber to a face of a fabric, steaming of fabric, spray'- ing the fabricwith a moisture resistant, and pressing the fabric. A

5. A method of manufacturing blankets for printing presses, consisting of vulcanizing rubber to a face of a fabric, steaming the fabric, 'treating the fabric with a substance having the characteristics of lycopodium, and pressing the fabric.

6. A blanket for printing presses consisting of a fabric at one face and rubber at its other face, the blanket being steamed and impregnated with a moisture resistant.

THOMAS L. McELROY. 

